Hello peeps,
A
very Good Morning everyone... It's a beautiful Friday today...Hope everyone
will have a great day!
I
have done some reading on the circuit operation of the BP to understand on the
basics better. Refer Figure 1 for the block diagram
Figure 1: BP Block Diagram
From
what I have understood, the BP circuit is split into 3 main stages which are
the pressure- sensor driving circuit, Oscillometric Pulse measuring circuit and
the Half- wave Rectifier circuit. Refer Figure 2, 3, 4 and 5 for the schematic
diagram of each stage.
Figure
2 is the driving circuit for the pressure sensor, where in this project I am
using the Honeywell SCC02DN pressure sensor of 0 to 5 psi (approx of 0 to
200mmHg) :) The pressure sensor connection is shown in Figure
2 and is labeled in a box/ square.
Figure
2: 1st stage of pressure- sensor driving circuit
Figure 3: 2nd stage of Oscillometric Pulse measuring circuit
Figure
4: 3rd stage of Half-wave Rectifier circuit
Figure
5, indicates the fully combined circuit of the BP stages from stage 1 to stage
3. It shows, how the circuit begins with the sensor driving circuit and how the
signal flows from High Pass Filter (HPF) to Low Pass Filter (LPF) and finally
to the rectifier circuit :)
Figure
5: Combined stages
After
doing some research and troubleshooting the previous BP circuit, I have come to
a decision to slightly modify the BP circuit into a more simplified
version...... :D Later, this BP PCB will be connected to the PIC
main board for further testing and troubleshooting. Hopefully it works....hehe
As
you can see in Figure 6, this BP circuit is much smaller and compact. However,
in order to know whether it works or not, I have to burn the program into the
PIC first. Meanwhile, have a look below, to see my masterpiece.. hahaha....!
Figure 6: PCB for BP
From
Figure 7, you can see that I'm done with the component placement and soldering.
Really sorry for the bad soldering....haha... I really don't have talent in
soldering...wink2.. ('.' )v
Figure 7: back view of the PCB
No
kidding that this BP circuit is difficult to design and I really hope that this
circuit could work. So, now all is left is the Heart rate PCB. Next week I will
show my progress on the Heart rate PCB. Till then hope you guys could patiently
wait for me....
That's
it for today...Going to Pasar Road tomorrow to buy some components for the
Heart rate PCB construction...I'll try my best to finish the Heart rate circuit
by next week.. See you guys soon..Take care :)
with
lots of luv <3, XOXO
Bye2
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Quote
of the day,
The first and greatest victory is to conquer yourself; to be
conquered by yourself is of all things most shameful and vile.
~Plato
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Regards,
Idriah
Safriza
